Improvement in drafting-compasses



H. J. MORGAN.

DRAFTIN G COMPASSES. I No.180,150. I Patented July 25,1876.

N FEI'ERS, FHDTO-LITHOGP-APNER, WASHINGTON, D C

NITED STATES,

PATENT OFFICE.

HENRY J. MORGAN, WASHINGTON, DISTRICT OF COLUMBIA.

IMPROVEMENT IN DRAFTlNG-COMPASSES.

Specification forming part of Letters Patent No. 180,l50, dated July 2'5, 1e76, application filed January 4, 1876. I

To all whom it may concern:

Be it known that I, HENRY J. MORGAN, of Washington, District of Columbia, have invented certain new and useful Improvements in Drafting-Compasses; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable othersskilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

Figurel is a side elevation of a pair of compasses embodying my invention in its simplest form. Fig. 2 shows the pencil-point detached. Fig. 3 is a side elevation of a pair of compasses, witha portion of the socket removed, to show the adaptation of the pencil-point-when made adjustable by means of a set-screw. Fig 4 shows the pencil-point provided with a spline. Fig. 5 shows the pencil-point with an angular shank, and fixed in the socket.

'The object of my invention is to produce an improvement in that class of drafting-compasses to one leg of which a pencil is applied for striking circles, arcs, 86c;- and it consists in combining, with such a pair of compasses a pencil-point with a feeding'piston adapted to drive a movable lead, and otherwise of a similar construction to the points commonly employed in pocket pencil-cases'but never beincased pencil invariably used, and when so prepared the pencil is at best but clumsily supported, and the point so much exposed as to be frequentlybroken.

By my new combination of devices the compasses are at once invested with all the advan-- The socket B upon the leg A, as is usual in V compasses of this class, is made, preferably, ofconsidera-ble depth, and provided with a set-screw, l), as shown in Fig. 3, and the pencil-pointis formed with an elongated stock, provided with a spline, c, as shown in Fig. 4, for the more secure setting of the latter within the former.

When so constructed, these points, pro-- vided with leads of different shades of color and varying degrees of hardness, may be readily exchanged or applied to different compasses, having the solidpointed leg E of-a greater or less length.

A simpler modification, but one not so efficient, is exhibited in Fig. 5, where the pencilpoint is provided merely with an angular shank, to enter a socket of corresponding form.

I claim as my invention- The combination, with the soeketed leg of a pair of drafting-compasses, substantially as shown, of the adjustable pencil-point O, adapted to carry and adjust a removable lead, when said point C is constructed and arranged to operate substantially as and for the purpose set forth.

In testimony that I claim the foregoing as my ownI afiix my signature in presence of two witnesses.

HENRY J. MORGAN.

Witnesses:

. Chaos. 0. FOLGER,

JAMES H. MANDEVILLE. 

